This is an experimental "empty" project template to write Flutter plugins in Swift ( a complete example : Flutter Audio : swift-based Flutter plugin example to play audio files).
Documentation about Flutter plugins and native Apis access from Flutter
Basically, a Flutter plugin is a platform channel subscriber/pusher, packaged and shared as a Dart pub package.
There is different types of channels :
- MethodChannel, allowing call native methods from Dart, and vice-versa.
- and BasicMessageChannel, which is an async stream between Flutter Dart code and the host platform.
When you create a plugin project with flutter CLI flutter create --plugin my_plugin, all generated iOS files are written in ObjectiveC.
In this template, I replaced the plugin generated .h & .m files with swift 3 files.
dynamic library in the Pods_Runner build settings.
The plugin main file is /ios/Classes/SwiftPluginPoc.swift
import Foundation
import Flutter
@objc public class SwiftPluginPocPlugin:NSObject{
var channel:FlutterMethodChannel
public init( controller:FlutterViewController){
channel = FlutterMethodChannel(name: "swift_plugin_poc", binaryMessenger: controller)
super.init()
channel.setMethodCallHandler(onMethodCall)
}
public func onMethodCall( _ call:FlutterMethodCall, result:FlutterResult ){
if call.method == "getPlatformVersion" {
result("iOS response : \(UIDevice.current.systemVersion)")
} else {
result( FlutterMethodNotImplemented)
}
}
}I also replaced all the example project files :
- AppDelegate.swift : the AppDelegate class only instantiate a PluginRegistry.
import UIKit
import AVFoundation
import Flutter
@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
var plugins: PluginRegistry?
override func application(_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?
) -> Bool {
guard let flutterController = self.window.rootViewController as? Flutter.FlutterViewController else {
print("no FlutterViewController")
return true
}
plugins = PluginRegistry(flutterController)
return true
}
}- PluginRegistry.swift : the PluginRegistry instantiate all the application plugins.
Here we import the swift_plugin_poc module, to access the SwiftPluginPocPlugin class.
import Foundation
import Flutter
import swift_plugin_poc
class PluginRegistry:NSObject{
var swift_plugin_poc:SwiftPluginPocPlugin
init(withController controller:FlutterViewController){
swift_plugin_poc = SwiftPluginPocPlugin(withController:controller)
}
}
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